I visited a small forum via a google search where I was redirected to a page "encouraging" me to disable adblock since the site runs on ad revenue. Of course, I abandoned the site.
There is already a wordpress plugin to detect adblockers [1]
Now, once sites start implementing these measures adblock developers will develop their product to circumvent these scripts. Content developers will update their script to break these new tools, adblock developers will update their tools to again circumvent the new script and the cycle continues.
Don't even think of paid for/subscription models because a large percentage of these sites know their content are not worth paying for so won't even bother considering it. They simply want eyeballs to attract advertisers.